<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./vue.js"></script>
</head>

<body>
    <div id="app">
        <one v-if="flag=='one'"></one>
        <two v-if="flag=='two'"></two>
        <button @click='change'>点击切换</button>
    </div>
    <script>
        Vue.component("one", {
            template: "<div>我是组件one</div>"
        })

        Vue.component("two", {
            template: "<div>我是组件two</div>"
        })
        new Vue({
            el: "#app",
            data: {
                flag: "one"
            },
            methods: {
                change() {
                    this.flag = this.flag === "one" ? "two" : "one"
                }
            },
        })
    </script>
</body>

</html>